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Published on: August 25, 2016
Acid-engineered sulfated zirconium oxide for highly sensitive and selective NH3 gas sensing
Jiali Hong1, Bingxue Cheng1, Xiaoqian Bai1
1Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Ministry of Ecology and Environment, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, PR China.
Acid treatment of sulfated zirconium oxide (Zr3SO9) significantly enhances ammonia (NH3) gas sensing. The modified sensor shows a sixfold increase in response and a low detection limit, improving safety and environmental monitoring.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Ammonia (NH3) gas detection is crucial for environmental and health safety.
- Sulfated metal oxides offer advantages in gas sensing due to their acidic properties.
- Developing highly sensitive NH3 sensors is an ongoing research challenge.
Purpose of the Study:
- To synthesize and modify Zr3SO9 for enhanced ammonia gas sensing.
- To investigate the effect of acid treatment on NH3 sensing performance.
- To elucidate the mechanism behind the improved sensing properties.
Main Methods:
- Hydrothermal synthesis of Zr3SO9.
- Acid treatment of Zr3SO9 using HCl.
- Characterization of NH3 sensing performance (response, detection limit, selectivity, repeatability).
- Analysis of surface acidity and redox properties.
Main Results:
- 2 M HCl-treated Zr3SO9 exhibited a sixfold increase in response to 50 ppm NH3 compared to pristine Zr3SO9.
- The modified sensor achieved a low detection limit of 0.26 ppm for NH3.
- Excellent selectivity and repeatability were maintained after acid treatment.
- Acid treatment enhanced surface acidity and optimized its distribution.
Conclusions:
- Acid site engineering is a key strategy for developing efficient metal oxide semiconductor sensors.
- The enhanced NH3 sensing performance is attributed to synergistic adsorption and redox-driven electron transfer.
- Modified Zr3SO9 shows great potential for practical applications in ammonia detection.
